I don't really have a cut off. Logan doesn't really ask to nurse in public often (he is 16 1/2 months). If he needs to nurse, then we do. I try to take him someplace out of the way, though. He is soooo easily distracted! It makes it indiscreet and painful to nurse where there are a lot of people! If Logan asks to nurse and it is out of boredom, I try to distract him. This is usually in the checkout lane or the soup aisle (I have no idea why that aisle always prompts requests for nursies, but it does)!